leprechaun

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

n. One of a race of elves in Irish folklore who can reveal hidden treasure to those who catch them.

from Wiktionary, Creative Commons Attribution/Share-Alike License

n. One of a race of elves who can reveal hidden treasure to those who catch it

from the GNU version of the Collaborative International Dictionary of English

n. A small mischievous elf or spirit in Irish folklore; it is often depicted in literature as a dwarfish bearded old man; -- legend tells that if a leprechaun is captured, he will reveal the location of his hidden pot of gold.

Examples

Unlike the first Leprechaun mentioned, this leprechaun is a good one who leads the marching band to Notre Dame Stadium, leads the students in cheers at games, and does many other public appearances for the university.